scripted-diff: fix leftover references to policy/fees.h

-BEGIN VERIFY SCRIPT-
git grep -l "policy\/fees\.h" | xargs sed -i "s/policy\/fees.h/policy\/fees\/block_policy_estimator.h/g"
-END VERIFY SCRIPT-

test/functional/wallet_fundrawtransaction.py

@@ -848,7 +848,7 @@ class RawTransactionsTest(BitcoinTestFramework):
                 assert_raises_rpc_error(-3, f"JSON value of type {k} for field conf_target is not of expected type number",
                     node.fundrawtransaction, rawtx, estimate_mode=mode, conf_target=v, add_inputs=True)
             for n in [-1, 0, 1009]:
-                assert_raises_rpc_error(-8, "Invalid conf_target, must be between 1 and 1008",  # max value of 1008 per src/policy/fees.h
+                assert_raises_rpc_error(-8, "Invalid conf_target, must be between 1 and 1008",  # max value of 1008 per src/policy/fees/block_policy_estimator.h
                     node.fundrawtransaction, rawtx, estimate_mode=mode, conf_target=n, add_inputs=True)
 
         self.log.info("Test invalid fee rate settings")